diff --git a/src/std/option.no b/src/std/option.no
index b9983d95..387251e3 100644
--- a/src/std/option.no
+++ b/src/std/option.no
@@ -20,6 +20,10 @@ impl <T> Option<T> {
         }
     }
 
+    pub fn isNone(self): Bool {
+        self.isSome().not()
+    }
+
     pub fn or(self, other: Option<T>): Option<T> {
         match self {
             Some() { self }